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在分析布里渊散射分布式光纤传感器检测原理的基础上 ,针对布里渊散射光信号比较微弱且和瑞利散射光之间存在频移的特点 ,采用微波电光调制产生频率可调的参考光 ,和后向布里渊散射光进行相干检测 ,得到放大的布里渊散射光信号 ,再用高速模拟数字转换和存储叠加进行时序信号处理 ,最后得到分布式传感信号。给出了各部分实验过程和结果 ,得出与理论分析一致的布里渊散射光频谱和光强随温度升高而产生变化。实现了 2 5km的分布式温度传感 ,初步实验结果证明了方案的可行性。
Based on the analysis of detection principle of Brillouin scattering distributed optical fiber sensor, aiming at the weak characteristic of Brillouin scattering optical signal and the frequency shift between Rayleigh scattered light, microwave electro-optical modulation is used to generate adjustable reference light , And the back-to-Brillouin scattering light is coherently detected to obtain an amplified Brillouin scattered light signal, and then high-speed analog-digital conversion and storage superposition for timing signal processing. Finally, a distributed sensing signal is obtained. The experiment and results of each part are given. The spectrum and intensity of Brillouin scattering light are consistent with the theoretical analysis. The distributed temperature sensing of 25 km has been achieved. The preliminary experimental results prove the feasibility of the scheme.